Arcosanti is like a really cool city in the middle of the desert in Arizona. It was made by a very smart man named Paolo Soleri who wanted to create a place where people could live in harmony with nature.
Imagine if you were building a sandcastle at the beach. You would need sand, water, some tools, and a plan in your head. That's like what Paolo Soleri did, but on a much bigger scale. He used dirt, rocks, and concrete to build a whole mini-city!
The idea behind Arcosanti is to use less space and resources to build homes and buildings for people to live and work in. The people who live in Arcosanti use things like solar power and recycling to make sure they don't waste anything. They also work together to grow their own food and take care of the environment around them.
Overall, Arcosanti is a really special place where people can live in a sustainable way and work together to make the world a better place.